Hi dorkfeatures, I actually created a community calendar just like that a few weeks ago with the hope that people creating new tournaments would come to me first. The community tournament section of WGT is very loose and quite often, random tournaments just pop up without rhyme or reason. And these tournaments end up being either huge tours or eight to sixteen player head-to-head tourneys, which are the majority of the community tournament section. Unfortunately, nobody came to my calendar before posting their tournament, and so I was not able to keep up my detailed calendar. However I am really excited to see EllisSpice continue working on his tourney list and applaud his continuous hard work.
Also, at TrevorTurner, most tournaments do not have start or end dates because sign-ups are usually open until a certain limit has been reached, and tournaments very rarely have specific dates by which each round must be played that do not change at some point or which are loosened to accomodate certain people.